Problem with SyncServices

I've got Espionage set up to encrypt Mail, iCal, Address book & SyncServices. It's been setup that way for a while, and everything worked fairly well until a recent upgrade. I first noticed that my XMarks for Safari wasn't syncing. When I try to manually sync, I get this message: "You have disabled syncing on this computer. Open iSync, go to 'File>Preferences', and enable sync". If I try to open iSync, I get the message that the Sync Manager is not available. Opening the MobileMe system preference pane and clicking the Sync tab yields the message "An unknown error occurred while performing a sync operation. Please check your account and network settings, then try again." Looking at the Espionage drop-down menu, shows that the SyncServices folder is unlocked, as well as Mail, Address Book, Calendars folders.
Any idea what's going on here?
Any idea what's going on here?